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Short strangle explained, and why the credit looks so good
A short strangle is one trade with two short options: an out-of-the-money put and an out-of-the-money call on the same stock, same expiry. You keep both premiums if the stock finishes between the strikes. Above the call strike, nothing caps what it can cost you.
The trade in one line
You sell a Put option below the stock price and a Call option above it. Same stock, same Expiration date. You collect both premiums the day you open it.
There is no long option behind either leg. That is what traders mean by "naked", and it is the whole story of this trade.
Why the credit is bigger than anything on the wheel
Two short options pay you twice. A short strangle collects more than a covered call, more than a cash-secured put, and more than an Iron condor built on the same two strikes.
The market is not being generous. An iron condor is a strangle with two long options bought behind it, and those long options cost money. Take them off and you keep that money. You also keep every dollar of risk they were covering.
The credit is the market's price for a worst case with no number in it. Bigger credit, worse worst case. That trade-off holds across every strategy in option strategies beyond the wheel.
A worked example, and it goes against us (hypothetical)
Northwind Freight, a made-up stock, trades at $100. It has been quiet for months.
Thirty days out, you sell a strangle.
| Leg | Strike | Premium | Credit |
|---|---|---|---|
| Sell 1 put | $90 | $1.50 | +$150 |
| Sell 1 call | $110 | $1.50 | +$150 |
| Total credit | $3.00 | +$300 |
Two numbers come out of that total credit, and this is where sellers slip:
- Lower break-even: $87. The put strike minus the total $3.00, not the put's own $1.50.
- Upper break-even: $113. The call strike plus the total $3.00.
Max gain: $300, anywhere between $90 and $110.
Now the news. A bigger company bids for Northwind. The stock gaps to $140 overnight and sits there into expiry.
- The $90 put expires worthless. Nothing to pay.
- The $110 call is $30 in the money. Closing it costs $3,000.
- You keep the $300 credit.
Net result: −$2,700.
Check that a second way. The stock finished $27 above the $113 break-even, and 27 × 100 = $2,700. Same number.
That is nine times the credit, from one headline, on a stock that had done nothing for months. Nobody got a chance to roll it. The gap happened while the market was shut.
Every outcome at expiry
Same trade: the $90 put and the $110 call, sold for $3.00 together (hypothetical).
| Northwind at expiry | Put side | Call side | Credit | Total |
|---|---|---|---|---|
| $0 | −$9,000 | — | +$300 | −$8,700 |
| $60 | −$3,000 | — | +$300 | −$2,700 |
| $80 | −$1,000 | — | +$300 | −$700 |
| $87 | −$300 | — | +$300 | $0 (break-even) |
| $90 | — | — | +$300 | +$300 |
| $100 | — | — | +$300 | +$300 (max gain) |
| $110 | — | — | +$300 | +$300 |
| $113 | — | −$300 | +$300 | $0 (break-even) |
| $130 | — | −$2,000 | +$300 | −$1,700 |
| $140 | — | −$3,000 | +$300 | −$2,700 |
| $200 | — | −$9,000 | +$300 | −$8,700 |
Read the first row and the last row together.
On the downside the damage stops, because a stock can only fall to zero. $9,000 for the shares minus the $300 credit is −$8,700, and that is the floor.
On the upside the table simply keeps going. $200 is not the end of it. There is no end of it.
The two sides are not the same risk
People describe a short strangle as "a cash-secured put and a covered call in one trade". That is only half true, and the half that is wrong is the expensive half.
| Put side | Call side | |
|---|---|---|
| Worst case | Stock goes to zero | No ceiling |
| If assigned | You buy 100 shares | You owe 100 shares you don't have |
| What you end up holding | A stock you can still sell a call against | A short share position your broker may close for you |
| Can you plan the worst case? | Yes, it's the strike × 100 | No |
The put side really is a cash-secured put without the cash. The call side is a naked call, and a naked call is a different animal: being assigned leaves you short 100 shares, which your broker will usually buy back at the market price the moment it notices.
What it holds in your account
A cash-secured put sets aside the strike in cash, and you know that number the day you open it. A short strangle does not work that way. Your broker holds a margin requirement against the two naked legs, the broker sets it, and it grows as the stock moves against you. A gap can turn a comfortable position into a margin call the same morning.
In Canada an uncovered short call is generally not allowed in a registered account such as a TFSA or RRSP, so a short strangle normally means a non-registered margin account — check your own broker's options agreement, because approval levels differ. This is also why naked calls sit at the top of every broker's options ladder, above spreads and well above covered calls.
How sellers try to control it
None of this makes the loss impossible. It makes it smaller or slower.
| Habit | What it actually does |
|---|---|
| Strikes far out of the money | Fewer losses, and each one bigger relative to the credit |
| Close the whole trade at a set profit, early | Takes the money off the table before a gap can find it |
| Close the tested side and leave the quiet one | Cuts the open-ended side; the remaining leg is a plain short option |
| Buy a cheap further-out call behind it | Puts a number back on the worst case — that is an iron condor |
| Avoid earnings and known event dates | Removes the scheduled gaps, not the unscheduled ones |
| Size it as if the move already happened | The only habit that survives contact with a gap |
That last row is the real one. Before you sell a strangle, pick a number the stock could reach on bad news, work the loss out at that price, and ask whether you would still be fine. If the answer is no, the trade is too big — not too early.
Who this is not for
If you are newer to selling options, a short strangle is the wrong first step past the wheel strategy. An iron condor trades some of the credit for a worst case you can write down, and a jade lizard removes the open-ended side entirely while keeping a short put. Both teach the same lesson for a known price.
Questions
What is a short strangle?
Selling an out-of-the-money put and an out-of-the-money call on the same stock and the same expiry, with no long options behind them. You collect both credits and keep them if the stock finishes between the two strikes.
What are the break-evens on a short strangle?
The put strike minus the total credit, and the call strike plus the total credit. On a $90 put and a $110 call sold for $3.00 together, that is $87 and $113 — not each leg's own premium.
What is the max loss on a short strangle?
On the put side it is the put strike × 100 minus the credit, if the stock goes to zero. On the call side there is no maximum, because there is no limit on how high a share price can go.
Is a short strangle the same as an iron condor?
No. An iron condor is a short strangle with a long put below and a long call above. Those long options cost part of the credit and in exchange they put a fixed number on the worst case.
Can I sell a strangle in a TFSA or RRSP?
Generally no, because of the uncovered call leg. Registered accounts in Canada usually allow covered calls and sometimes cash-secured puts. Ask your broker what your account is approved for before you plan a trade around it.
Does closing the tested side fix a losing strangle?
It stops the open-ended part and leaves you with one short option. It does not recover what the tested side already cost, and the leg you keep can be tested next if the stock turns around.
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